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There are uniform electric and magnetic fields in a region pointing along X-axis. An \alpha -particle is projected along Y-axis with a velocity v. The shape of the trajectory will be 
Option: 1 circular in XZ plane 
Option: 2 circular in YZ plane 
Option: 3 helical with its axis parallel to X-axis 
Option: 4 helical with its axis parallel to Y-axis

Answers (1)

The shape of the trajectory will be helical with its axis parallel to X-axis 

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Safeer PP

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